Burrowing, armored organisms found on the Planet SR388 in the Game Boy video game Metroid II: Return of Samus.

ABILITIES:These creatures can quickly dig through all but the hardest substances with their four powerful legs. A Gravitt typically hollows out a small hole--large enough to fit its body, but not its shell--in solid rock, or similar materials, in which to dwell (on SR388, they seem to favor making their homes in abandoned Chozo ruins). While embedded in the ground, a Gravitt can feel the vibrations of anything moving nearby. If it detects movement in this manner, the Gravitt will quickly rise from its burrow and attack whatever has invaded its territory. A Gravitt's three-pronged shell is extremely dense--conventional weapons cannot penetrate it and it deters all of SR388's predators, except the ravenous Metroid.

WEAKNESSES:
A Gravitt's shell may be tough, but its body is very soft in comparison and easily damaged. These creatures are easily recognized and avoided because their characteristic three-pronged shell always protrudes from the ground.